产品概述 返回TOPcQx嘉泰姆
CXLE8173是一款专用于大尺寸LCD面板LED背光驱动器，其内部集成大功率/高效率升压转换器，同时提供4通道LED电流驱动电路。CXLE8173内置固定开关频率的电流模式升压控制器，此结构能在每个开关周期内都有效控制电感峰值电流。CXLE8173输入电压范围从4.5V~28V，其升压转换器开关频率可由外接电阻进行设定，此控制器驱动一个外接的功率管为LED背光提供驱动电压。利用外接电阻可设定CXLE8173 12CHs LED电流，同时12通道间LED电流匹配达±1.5%，每一通道LED电流精度高达±2%，此性能保证了LED背光亮度的均一性与精确性。CXLE8173具有3uA关断电流，0.85V (ILED@60mA)反馈电压，单串LED可达18颗，最大65V输出电压将极大改善芯片效率，降低了功耗。CXLE8173支持PWM亮度调光模式，在PWM调光时，LED电流开启/关断的占空比和频率完全由PWMI端输入的PWM调光信号控制，且二者同步。CXLE8173内置多种保护功能，如LED开路、LED短路、输出过压、过温、输入过流，以及VCC欠压等，这些保护能有效的防止LED背光的失效。CXLE8173采用SOP-16封装。The CXLE8173 is a high power and high efficiency
boost controller with 4-channel current sinker which is
ideal for large LCD backlighting applications.
CXLE8173 uses current mode, fixed frequency
architecture which can clamp the inductor peak current
each cycle. The switching frequency is programmable
by an external frequency setting resistor. It drives an
external MOSFET to boost up the output voltage from
a 4.5V to 28V input supply. The CXLE8173regulates
the current in each LED string to the programmed
value set by an external current setting resistor. The
CXLE8173current matching can achieve ±1.5% and
regulation accuracy can reach ±2%.
A 3μA shutdown current and 0.85V (ILED@180mA)
feedback voltage and Maximum 65V output allows for
up to 18 high-power LEDs in series will greatly
improve efficiency and reduce power dissipation.
The device supports pulse width modulation (PWM)
brightness dimming. During digital PWM dimming,
the WLED current is turned on/off at the duty cycle
and frequency determined by the PWM signal on the
PWMI pin.
The CXLE8173integrated multiple protect functions,
such as LED Open, LED Short, Output Over Voltage,
Over thermal, Input Over Current, and Under Voltage
Lockout (UVLO), these protection will prevent the
LCD backlight from damage.
CXLE8173is available in 16pin SOP packages.
产品特点 返回TOPcQx嘉泰姆
cQx嘉泰姆
• 3uA关断电流cQx嘉泰姆
• 可驱动4串LED并联，单串可达18LEDscQx嘉泰姆
• 支持外部PWM调光cQx嘉泰姆
• 高达65V输出电压cQx嘉泰姆
• 单串驱动电流可达180mAcQx嘉泰姆
• 宽输入电压范围：4.5V ~ 28VcQx嘉泰姆
• 通道之间电流匹配精度为±1.5%cQx嘉泰姆
• 外接电阻设置升压转换器频率</p>
• 内置多种保护功能cQx嘉泰姆
-电流极限保护cQx嘉泰姆
-LED短路检测</p>
-过温保护cQx嘉泰姆
-输出过压保护cQx嘉泰姆
• 关断模式下LED电流完全关断cQx嘉泰姆
• 集成UVLO/过热保护cQx嘉泰姆
• 最小0.5μs LED开启时间</p>
• 热增强16引脚的SOP-16封装cQx嘉泰姆
• 符合RoHS指令，100%无铅封装cQx嘉泰姆
3μA shutdown currentcQx嘉泰姆
4 strings in parallel and up to 18 LEDs percQx嘉泰姆
stringcQx嘉泰姆
External PWM Dimming ControlcQx嘉泰姆
Output voltage up to 65VcQx嘉泰姆
Up to 180mA Drive Capability for Each StringcQx嘉泰姆
Wide Input voltage range 4.5V to 28VcQx嘉泰姆
Better than 1.5% LED Current RegulationcQx嘉泰姆
Accuracy Between StringscQx嘉泰姆
Boost Switching frequency can be programmedcQx嘉泰姆
by external resistorcQx嘉泰姆
Multiple Fault ProtectionscQx嘉泰姆
-Current Limit protectioncQx嘉泰姆
-Output Short circuit detectioncQx嘉泰姆
-Over-temperature protectioncQx嘉泰姆
-Output Over-voltage protectioncQx嘉泰姆
LED current turn off in shutdown modecQx嘉泰姆
Integrated UVLO/ Over Thermal protectioncQx嘉泰姆
Minimal 0.5μs LED On-Time regulationcQx嘉泰姆
Thermal Enhanced 16pin SOP-16 PackagecQx嘉泰姆
RoHS Compliant and 100% Lead (Pb)-FreecQx嘉泰姆
Halogen-FreecQx嘉泰姆
应用范围 返回TOPcQx嘉泰姆
cQx嘉泰姆
• LCD监视器背光</p>
• LCD-电视背光 cQx嘉泰姆
LCD Monitor LED Backlighting
cQx嘉泰姆
LCD-TV LED BacklightingcQx嘉泰姆
技术规格书（产品PDF) 返回TOP cQx嘉泰姆
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